Kaden Bayne Vanciel ![Artist - Artist -](https://derpicdn.net/badges/2016/8/23/540676fb2fd6546ee45a1c1.svg)
How long can they last underwater for? Twilight will probably need to sort things out with Queen Novo to get help. Also, I saw a few Derpibooru images of Celestia and Novo as childhood friends, which might make use of a headcanon, or the main canon.